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multi-pack-index: add format details 

The multi-pack-index feature generalizes the existing pack-index
feature by indexing objects across multiple pack-files.

Describe the basic file format, using a 12-byte header followed by
a lookup table for a list of "chunks" which will be described later.
The file ends with a footer containing a checksum using the hash
algorithm.

The header allows later versions to create breaking changes by
advancing the version number. We can also change the hash algorithm
using a different version value.

We will add the individual chunk format information as we introduce
the code that writes that information.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2018-07-12 15:39:19 -04:00 committed by Junio C Hamano
parent ceab693d1f
commit e0d1bcf825
1 changed files with 49 additions and 0 deletions
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49
Documentation/technical/pack-format.txt
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@ -252,3 +252,52 @@ Pack file entry: <+
corresponding packfile.
20-byte SHA-1-checksum of all of the above.
== multi-pack-index (MIDX) files have the following format:
The multi-pack-index files refer to multiple pack-files and loose objects.
In order to allow extensions that add extra data to the MIDX, we organize
the body into "chunks" and provide a lookup table at the beginning of the
body. The header includes certain length values, such as the number of packs,
the number of base MIDX files, hash lengths and types.
All 4-byte numbers are in network order.
HEADER:
4-byte signature:
The signature is: {'M', 'I', 'D', 'X'}
1-byte version number:
Git only writes or recognizes version 1.
1-byte Object Id Version
Git only writes or recognizes version 1 (SHA1).
1-byte number of "chunks"
1-byte number of base multi-pack-index files:
This value is currently always zero.
4-byte number of pack files
CHUNK LOOKUP:
(C + 1) * 12 bytes providing the chunk offsets:
First 4 bytes describe chunk id. Value 0 is a terminating label.
Other 8 bytes provide offset in current file for chunk to start.
(Chunks are provided in file-order, so you can infer the length
using the next chunk position if necessary.)
The remaining data in the body is described one chunk at a time, and
these chunks may be given in any order. Chunks are required unless
otherwise specified.
CHUNK DATA:
(This section intentionally left incomplete.)
TRAILER:
20-byte SHA1-checksum of the above contents.